␡
- Creating an Application
- Working with Components
- Lists
- The Java Class Library
- Summary
- Q and A
- Quiz
- Certification Practice
- Exercises
This chapter is from the book
This chapter is from the book
This chapter is from the book
This chapter is from the book
Certification Practice
The following question is the kind of thing you could expect to be asked on a Java programming certification test. Answer it without looking again at this lesson or using the Java compiler to test the code.
Given:
import javax.swing.*;
public class Display extends JFrame {
public Display() {
super("Display");
// answer goes here
JLabel hello = new JLabel("Hello");
JPanel pane = new JPanel();
add(hello);
pack();
setVisible(true);
}
public static void main(String[] arguments) {
Display ds = new Display();
}
}
What statement needs to replace // answer goes here to make the application function properly?
A. setSize(300, 200);
B. setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
C. Display ds = new Display();
D. No statement is needed.
The answer is available on the book’s website, at www.java21days.com. Visit the Lesson 9 page and click the Certification Practice link.